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<head>
    <meta charset="UTF-8">
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    <title>Document</title>
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<body>
    <div id="app" onclick="handleClick()">
        hello
    </div>
    <script>
        // var app = document.getElementById("app");
        // app.onclick = function(){
        //     console.log(this.innerHTML);
        // }
        // $("#app").click(function(){
        //     console.log($(this).html());
        // })
        var app = document.getElementById("app");
        var handleClick = function () {
            console.log(this.innerHTML);
        }.bind(app)
    </script>
</body>

</html>